- Machine Shop & Tool Repair Service, San Martin
- Machine Tool Repair & Rebuild, San Martin
- Machine Tools , San Martin
- Machinery, Supplies & Equipment - Business Production Related, San Martin
- Machinery, Supplies & Equipment - Business Supplies Related, San Martin
- Machinery, Supplies & Equipment - Construction & Contractor Related, San Martin
- Major Appliances, San Martin - Household & Kitchen
- Manufacturing, San Martin
- Manufacturing Products, San Martin
- Masonry Contractors, San Martin - Stone Mason, Brick Mason - Install & Repair
- Maytag Appliances, San Martin
- Mechanical Contractors, San Martin - Install, Service & Repair
- Men's & Boys Clothing & Accessories Stores, San Martin
- Mens & Boys Jeans & Western Wear Stores, San Martin
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- Merchandise Sales Events, San Martin
- Metal Specialties, San Martin
- Mini & Self Storage, San Martin
- Miscellaneous Business Services, San Martin
- Miscellaneous Government, San Martin
- Miscellaneous Manufacturing, San Martin
- Miscellaneous Personal Services, San Martin
- Miscellaneous Photographers, San Martin
- Motor Vehicle, San Martin
- Motor Vehicle Rental & Leasing, San Martin
- Moving Companies, San Martin
- Moving Supplies & Equipment Rental, San Martin
- Moving Truck Rental , San Martin
- Museums, San Martin
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